DTC

Engine Type

Meaning of DTC

Z5

BP

P1523

O

VICS Solenoid Circuit Malfunction

P0400

O

EGR Flow Malfunction

P1797

O

O

Neutral SW. Clutch SW(MT)/ N Range (AT) Circuit Malfunction

P0510

O

O

Closed Throttle Position Switch Circuit Malfunction

P0135

O

Front O2 Sensor Heater Circuit Malfunction

P0703

O

O

Brake Switch Circuit Malfunction

Vehicles and PCMs that may set the VICS solenoid circuit malfunction code during low battery conditions

Model

VIN Range

Production Date

Affected PCM(s)

Cal M/T

JM1BA142*S0199999

Up to 5/11/95

BPD5-18-881, A, R, R-0A

Cal A/T

JM1BA142*S0199999

Up to 5/11/95

BPD6-18-881, A, R, R-0A

Fed M/T

JM1BA142*S0199999

Up to 5/11/95

BPD3-18-881, A, R, R-0A

Fed A/T

JM1BA142*S0199999

Up to 5/11/95

BPD4-18-881, A, R, R-0A

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Was FREEZE FRAME DATA stored in memory for P1523 ?

Yes

Go to next step.

No

Go to step 4.

3.

Did FREEZE FRAME DATA indicate codes were set during a start up condition ?

Example:

Load 99%, RPM 500, VSS 0 mph etc...

Yes

Code was most likely caused by a low battery condition during start up. Inspect battery using S/B 001/97 Category G. If battery checks good, customer should be questioned on whether the vehicle was stored for a period of time, or if the battery had gone dead recently.

If vehicle is stored for periods of time or is driven very little, go to step 6.

No

Go to next step.

4.

Check VICS solenoid circuit.

1. 12 volts at the W/R wire (at solenoid connector) with ignition on and solenoid disconnected.

2. Check terminal tightness of GY/B wire in connector X-18 (INJ to EM Harness).

3. Continuity between GY/B wire of solenoid connector and PCM terminal 4K.

4. Check for open between terminals of the solenoid.

Was an open or short found?

Yes

Make necessary repairs, then go to step 7.

No

Go to next step.

5.

Remove battery and battery tray and check tightness of main ground cable to transmission bracket.

Was cable found to be loose?

Yes

Relocate ground cable to bolt that holds bracket to transmission, then go to step 7.

No

Go to next step.

6.

If vehicle is driven very little or is stored for periods of time, remove PCM to confirm that current PCM is "NOT" one of the following:

Is the PCM one of the part numbers listed above?

Yes

Current PCM has already been modified for this code. Go back to step 4.

No

Replace PCM, then go to next step.

7.

Clear DTC. Road test vehicle to confirm repair.

Did MIL return ?

Yes

Go back to step 1.

No

Repairs are complete.

Vehicles and PCMs that may set the EGR flow malfunction code, during certain driving conditions.

Model

VIN Range

Production Date

Affected PCM(s)

Fed

M/T

JM1BA141*S0199999

Up to 5/11/95

Z501-18-881, A

A/T

JM1BA141*S0199999

Up to 5/11/95

Z502-18-881, A

Cal

M/T

JM1BA141*S0199999

Up to 5/11/95

Z503-18-881, A

A/T

JM1BA141*S0199999

Up to 5/11/95

Z504-18-881, A

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Were there any other codes stored in memory ?

Yes

Perform diagnosis for DTC, then go to next step.

No

Go to next step.

3.

Perform EGR VAC idle simulation test with engine at normal operating temperature.

Did engine stall out with duty percentage set at 100 % ?

NOTE: During simulation test, DTC P1402 may be set in memory, it should be ignored, and deleted when all DTC are erased.

Yes

Go to next step.

No

Determine cause of malfunction. Simulation test indicates vacuum is not being applied to EGR valve. Check for disconnected, pinched or blocked vacuum hoses, EGR vacuum solenoid or EGR valve, also check for voltage signal chance at GY/R wire of EGR vacuum solenoid during simulation test.

(Should switch from B+ to below 1.0V during simulation test)

Then go to step 7.

4.

Check EGR boost sensor solenoid operation. (See workshop manual page F1-35) Also check EGR boost sensor hose from EGR valve to EGR boost sensor solenoid for correct routing, pinches, and/or for being disconnected. (See illustration)

Were there any faults found within the boost sensor solenoid system ?

Yes

Make necessary repairs, then go to step 7.

No

Go to next step.

5.

Check EGR boost sensor voltage using the following procedure and diagrams.

1. With ignition on, measure the voltage between LG/R wire and the B/R wire, with a voltmeter, from the rear side of the connector.

   Specification: 5.0 Vref voltage

2. Disconnect the vacuum hose from the boost sensor.

3. Apply vacuum to the EGR boost sensor using a vacuum pump.

4. Monitor the BARO V voltage with the NGS tester through the PID DATA MONITOR AND RECORD screen, or with a voltmeter between the GY wire and the B/R wire from the rear side of the connector.

   Specification:

   4.6V @ 0.0 inHg 3.6V @ 5.0 inHg 2.2V @ 13.0 inHg 0.9V @ 20.0 inHg

Were there any faults found with boost sensor?

Yes

If fault was found in step 1, determine cause of incorrect Vref voltage.

If fault is found in boost sensor voltage reading, replace boost sensor, then go to step 7.

No

Go to next step.

6.

Is the PCM that is currently in the vehicle one of the part numbers listed below.

Yes

Current PCM has already been modified for code P0400.

Go back to step 3.

No

Replace PCM, then go to next step.

7.

Clear DTC. Road test vehicle to confirm repair.

Did MIL return ?

Yes

Go back to step 1.

No

Repairs are complete.

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Were there any codes other then P1797 stored in memory ?

Yes

Perform diagnosis for DTC, then go to next step.

No

Go to next step.

3.

Monitor the Clutch/Neutral switch Transaxle range switch neutral/park circuit with the NGS tester.

Did signals change when transmission was put in and out of gear and clutch pedal pressed and released ?

Yes

MTX: Go to next step

ATX: Go to step 5.

No

Check the following

MTX:

1. Clutch & neutral switch ( see page F1-53).

2. For an open or short in B/L wires from terminal 1L of PCM to clutch and neutral switches (signal changes from B+ to below 1V when switches are closed to ground.)

3. For an open in the black wire from the clutch and neutral switches to ground.

ATX:

1. TRS (Transaxle Range Switch, (page K-20).

2. For an open or short in the B/L wire terminal 1L of PCM to the TRS (signal changes from B+ to below 1V when TRS is in P or N ranges).

3. For open in B/R wire from TRS to ground.

NOTE: See wiring diagrams for related connectors.

4.

Install updated clutch switch stopper.

Part number: BOY1-43-029

See installation instructions.

5.

Check for intermittent open in circuits as mentioned in step 3 for ATX transmission.

Was loose terminal or connector found?

Yes

Make necessary repair, then go to next step.

No

Go to next step.

6.

Clear DTC, then road test vehicle to confirm MIL does not return.

Did MIL return ?

Yes

Go back to step 1.

No

Repair is complete.

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Were there any codes other then P0510 stored in memory ?

Yes

Perform diagnosis for DTC, then go to next step.

No

Customer should be questioned on what foot they brake with. If customer brakes with left and depresses the accelerator with the right they should be informed that this type of driving style sends conflicting signals to the PCM and will cause codes / MIL. If only DTC P0510 was in memory and driving style cannot be determined, go to step 3.

3.

Monitor the closed throttle position switch with the NGS tester.

PID's (CTP SW)

Did signals change when throttle was opened and closed ?

Yes

Go to next step.

No

Check the following:

1. Closed throttle position switch ( page F1-52).

2. For an open or short in the SB wire from the closed throttle position switch to terminal 3L of the PCM (signal changes from below 1V to B+ when the throttle is opened).

4.

1. Using a digital voltmeter, adjust the TPS to exactly 0.8 volts.

   NOTE: Do not exceed 0.8v and don't use the NGS tester readings when doing the above adjustment.

2. Check BASE IDLE and TIMING, adjust if necessary.

3. Clear DTC

_

Repair is complete.

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Were there any other codes stored in memory ?

Yes

Perform diagnosis for DTC, then go to next step.

No

Go to step 4.

3.

Did FREEZE FRAME DATA indicate codes were set during a start up condition ?

Example:

Load 99%, RPM 500, VSS 0 mph etc

Yes

Code was most likely caused by a low battery condition during, start up. Inspect battery using S/B 001/97 Category G. If battery checks good, customer should be questioned on whether the vehicle was stored for a period of time, or if the battery had gone dead recently.

If vehicle is stored for periods of time or is driven very little, go to step 5.

No

Go to next step.

4.

Check front O² sensor heater circuit for:

1. 12 volts at O² sensor connector B/W wire (harness side) with ignition on and O² sensor disconnected.

2. Continuity between O² sensor connector V/Y wire (harness side) and the PCM terminal 3M.

3. The resistance between the white wires of the O² sensor connector (sensor side) should be approximately 6 at [20C {68F} ].

Was an open or short found?

Yes

Make necessary repairs, then go to step 6.

No

Go to next step.

5.

Remove battery and battery tray and check tightness of main ground cable to transmission bracket.

Was cable found to be loose ?

Yes

Relocate ground cable to bolt that holds bracket to transmission, then go to step 7.

No

Go to next step.

6.

If vehicle is driven very little or is stored for periods of time, remove PCM to confirm that current PCM is NOT one of the following:

Is the PCM one of the part numbers listed above ?

Yes

Current PCM has already been modified to eliminate this code from being set under low battery conditions.

Recheck O² sensor circuit for poor terminal tightness.

No

Replace PCM, then go to next step.

7.

Clear DTC. Road test vehicle to confirm repair.

Did MIL return ?

Yes

Go back to step 1.

No

Repairs are complete.

Step

Inspection

Action

1.

Retrieve FREEZE FRAME DATA and TROUBLE CODES and record them on repair order for future use.

_

Go to next step.

2.

Are brake lights working ?

Yes

Go to next step.

No

Go to step 4.

3.

Monitor Brake Switch on NGS tester screen

PID (BRK SW)

Did signal change when brake pedal was pressed and released ?

Yes

Check for poor terminal tightness and or loose connectors in the brake switch circuit that would cause an intermittent open in the G/Y wire between the brake switch and the PCM terminal 1Q. Then go to step 5.

No

Repair open in the G/Y wire between brake switch and PCM terminal 1Q. Then go to step 5.

4.

Check for blown 15 amp STOP fuse.

Was fuse blown ?

Yes

Determine cause of short in brake light circuit, and make necessary repairs, then go to step 5.

No

Check the following:

1. Check brake light switch.

   ( See W/S manual page P-7 )

2. Also check for open in G wire between STOP fuse and brake switch.

Make necessary repairs, then go to step 5.

5.

Clear DTC, road test vehicle to confirm MIL does not return.

Did MIL return ?

Yes

Go back to step 1.

No

Repair is complete.